>>102187710Considering how crude blood bending is at full strength, the equivalent for a firebender would probably be, at best, causing muscles to contract violently in a semi useful way or just shutting things down so a person loses complete muscle control. At worst, they would probably cause massive, life-long neurological damage if they don't die from their heart shutting down.
Out of the possible ways benders could use their powers to manipulate others, firebending would probably be the most terrifying because of its aftereffects.
